Bathtub



FIG. 1 is a perspective view taken from the top and front of a bathtub showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a cross sectional view taken on line 4--4 of FIG. 1; and

FIG. 5 is a cross sectional view taken on line 5--5 of FIG. 1. 

The ornamental design for a bathtub, as shown. 